Mechanical properties of 4 rocks at different temperatures and fracture assessment using the strain energy density criterion

Justo, Juan B.; Castro, José Villaverde

doi:10.1016/j.gete.2020.100212

Cited by 25 publications

(13 citation statements)

References 57 publications

(96 reference statements)

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“…Urosevic et al ( 28) also used UPV to evaluate Alfacar travertine, very similar to AT, and obtained an elastic modulus of 59.57 GPa, very close to the value assessed via FFR (51.9 GPa). Some existing works various types of Macael marble (43,44) indicate elastic properties of the same order of magnitude as the values obtained in the present study, although slightly lower. These small differences, considering the intrinsic variability in the mechanical properties of a natural material such as stone, reinforce the hypothesis of the validity of the FFR methodology for mechanical characterization.…”

Section: Test Results In Dry Conditionssupporting

confidence: 83%

Free-free resonance method for the mechanical characterization of carbonate rocks used as building stones

et al. 2022

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Nondestructive testing techniques have attracted growing interest in the last few years due to their ability to assess material properties without damaging the specimens. The free-free resonance method is a nondestructive testing technique based on the analysis of the natural frequencies of a sample. This study presents and discusses the applicability of this technique, traditionally used on soils, for the mechanical characterization of rocks. With this aim, the free-free resonance method is used to obtain the dynamic elastic modulus and shear modulus of four carbonate rocks that have been widely used as construction materials in southern Spain. The results from the nondestructive evaluation of dry and saturated rocks, in combination with petrographic characterization and uniaxial compression tests, make it possible to assess the existing relationships between the mechanical properties of carbonate rocks and to evaluate the impact of porosity and moisture content on their mechanical behavior.

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Section: Test Results In Dry Conditionssupporting

confidence: 83%

Free-free resonance method for the mechanical characterization of carbonate rocks used as building stones

et al. 2022

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“…Due to the needs of nuclear waste storage, geothermal resource development, and many other engineering constructions [1][2][3][4][5][6][7][8], the mechanical properties of rocks after high temperature have caused extensive research by scholars.…”

Section: Introductionmentioning

confidence: 99%

The Size Effect and Microstructure Changes of Granite after Heat Treatment

Zhang

Song

et al. 2021

Advances in Materials Science and Engineering

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High temperature can change the mechanical properties of granite, with significant nonlinear characteristics, and at the same time change its microstructure. Therefore, two kinds of granites are used in this paper: one is normal temperature granite and the other is granite treated at 600°C, and a detailed comparative study is made. The fracture toughness of two kinds of rocks was tested by fracture tests, and the results were analyzed by a nonlinear fracture mechanics model (SEL). At the same time, in order to understand the influence of high temperature on the mineral composition and microstructure of granite, XRD, optical microscope, and SEM were used to observe the mineral composition, microcracks, and fracture morphology of granite. The results show the following: (1) high temperature significantly changes the fracture mechanics parameters of granite. The fracture toughness of granite treated at 600°C is significantly lower than that of untreated granite, which is reduced by more than 60%. (2) No obvious size effect was found in the untreated granite, while the size effect of the granite after treatment at 600°C was significant. (3) The granite after high-temperature treatment showed strong nonlinear characteristics, and the SEL can reasonably describe and explain its nonlinear fracture characteristics. (4) The brittleness of the granite treated at 600°C decreased and the ductility increased. The microscopic morphology of the fracture was rough, with obvious steps and rivers. The microcracks and porosity had increased significantly, but the main components did not change significantly.

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“…In Eq (7), the strain energy density has units of energy per volume, i.e., pressure. Thus, coefficients a and b have units of the inverse of pressure (Eq 3), c is dimensionless and d has units of pressure and it may be combined with the strain energy density for the sake of simplicity.…”

Section: Tension-compression Yield Asymmetrymentioning

confidence: 99%

“…Nowadays, the Theory of Critical Distances (e.g., [ 4 ]) allows to apply stress-based criteria, avoiding the singularity of stresses at the crack front, and, on the other hand, the average strain energy density criterion [ 5 ] is another successful method for fracture assessment. Fracture mechanics is one of the fields that the author has worked in and motives this work [ 6 , 7 ], and the other is constitutive modelling of soft soils using elasto-plastic models [ 8 , 9 ].…”

Section: Introductionmentioning

confidence: 99%

Elastic potentials as yield surfaces for isotropic materials

Castro

2022

PLoS ONE

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This paper proposes that elastic potentials, which may be rigorously formulated using the negative Gibbs free energy or the complementary strain energy density, may be used as the yield surface of elasto-plastic constitutive models. Thus, the yield surface may be assumed in some materials as an elastic potential surface for a specific level of critical complementary strain energy density. Traditional approaches, such as the total strain energy criterion, only consider second order terms, i.e., the elastic potential is centred at the origin of the current stress state. Here, first order terms are considered, and consequently, the elastic potential may be translated, which allows to reproduce the desired level of tension-compression asymmetry. The proposed approach only adds two additional parameters, e.g., uniaxial compressive and tensile yield limits, to the elastic ones. For linear elasticity, the proposed approach provides elliptical yield surfaces and shows a correlation between the shape of the ellipse and the Poisson’s ratio, which agree with published experimental data for soils and metallic glasses. This elliptical yield surface also fits well experimental values of amorphous polymers and some rocks. Besides, the proposed approach automatically considers the influence of the intermediate stress. For non-linear elasticity, a wider range of elastic potentials, i.e., yield surfaces, are possible, such as distorted ellipsoids. For the case of incompressible non-linear materials, the yield surfaces are between von Mises and Tresca ones.

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Mechanical properties of 4 rocks at different temperatures and fracture assessment using the strain energy density criterion

Cited by 25 publications

References 57 publications

Free-free resonance method for the mechanical characterization of carbonate rocks used as building stones

Free-free resonance method for the mechanical characterization of carbonate rocks used as building stones

The Size Effect and Microstructure Changes of Granite after Heat Treatment

Elastic potentials as yield surfaces for isotropic materials

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